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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f4370e126a57dfc02cc72a5cccf0964565271c1ec4a84ea6e347c84a65cf52c3' 
  AND token = 't1nusKzgTjCs2B8+RolJdznCJg/u1Po0yoQ7jWCQUjk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}